DTC P0013: Camshaft Position "B" Actuator Circuit (Bank 1): Description
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The Camshaft Position (CMP) actuator is controlled by the PCM through a high control circuit and a low reference circuit. The high control circuit carries a 12-volt Pulse-Width Modulated (PWM) signal from the PCM to the CMP actuator solenoid in order to control the amount of engine oil flow to the cam phaser. The low reference circuit is used as a return circuit. The PCM has the ability to monitor the functionality of the high control and the low reference circuit. If the PCM detects an open, short to ground, or a short to voltage, DTC P0013 sets.